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    SubjectFollow up to: NFS/RPC Hangs after updating time...
    Date
    From
    This is a follow-up...

    After a huge pain in the rear upgrading from a
    2.6.11++ to a 2.6.23-rc3 (I'll give the powerpc
    folks a 'piece' of my mind on that front) - the
    NFS hang problem that I was experiencing on the
    older kernel is NOT occurring on this new version.

    Now what do I do?

    Is the net/sunrpc net/nfsx pieces isolated enough
    from the rest of the kernel that I could fork-lift
    it back to the 2.6.11 (or is that really a lost cause).

    Thanks for any/all feedback on this front!


    -----Original Message-----
    From: J. Bruce Fields [mailto:bfields@fieldses.org]
    Sent: Wednesday, August 22, 2007 4:27 PM
    To: Morrison, Tom
    Cc: nfs@lists.sourceforge.net; linux-kernel@vger.kernel.org; Rushton,
    Matt
    Subject: Re: NFS/RPC Hangs after updating time...

    On Wed, Aug 22, 2007 at 02:37:22PM -0400, Morrison, Tom wrote:
    > I am working with a 2.6.11++ kernel on an embedded
    > server platform that is NFS serving Linux rootfs
    > for other embedded NFS Client boards.
    >
    > Everything works fine when the system time on the
    > server board is relatively synchronized with the real-time.
    >
    > It hangs after attempting to update the time from a
    > nonsensical time (e.g.: 2 months ago) - the most significant
    > part of it is that it only hangs IFF it has started
    > serving its NFS client boards before I attempt to
    > update the time.
    >
    >
    > The most significant output (when turning on
    > RPC debugging) is from:
    >
    > linux/net/sunrpc/cache.c (cache_check) - line 90:
    >
    > >> Want update, refage=1800, age=4288285
    >
    > It continually loops through this method - and the cache
    > never gets updated...even thought with some additional
    > sleuthing (aka: additional debug printks - it thinks
    > that there is an cache update pending).

    Can you reproduce the problem with the current kernel? (Say 2.6.22 or
    later?)

    --b.
    -
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